    export const member6 = () => {
        function year(a) {
            if (year % 4 === 0 && year % 100 !== 0 || (year % 400 === 0)) {
                console.log("这是闰年！");
            } else {
                console.log("这不是闰年！");
            }
        }
        year(2020)
        return
    }
    console.log(member6());